1)His breathing has become increasingly difficult.
2)He has to breathe through his mouth.
3)He is short of breath, even when he has not been exercising, he is breathless.
4)His cough is more like wheezing.
5)His cough is dry, producing no phlegm.
6)He has coughed up blood.
7)His nose stuffed up when he had a cold.
8)He coughs up a lot of phlegm thick spit on most days.
9)He has a feeling of tightness in the chest or a feeling that he is suffocating.